Excel 2007: XLS treated the same as XLSM?


Board Regular
May 20, 2009
My client is moving from Excel 2003 to Excel 2007 very slowly (1-2 years). I'm tasked with making sure their models work in both Excel 2003 and 2007. They would like to keep the file extension as "XLS".

My question is, does Excel 2007 treat "XLS" files differently from "XLSM" files? There is a lot of VBA, charts, and formulas in these models.

Thank you for any replies!

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Board Regular
May 20, 2009
Thanks, XLD. I'll have to investigate. Microsoft products are automatically updated on the company laptops that are issued to everyone.

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